body > div {
    border: 2px solid black;
    border-radius: 5px;
    margin: 20px;
    padding: 20px;
}

h2 {
    margin-left: 15px;
    margin-top: 10px;
    margin-bottom: 10px;
}

h3 {
    margin-left: 30px;
    margin-top: 10px;
    margin-bottom: 10px;
}

.scroll {

}

.scroll::-webkit-scrollbar {
    /*滚动条整体样式*/
    width: 10px; /*高宽分别对应横竖滚动条的尺寸*/
    height: 1px;
}

.scroll::-webkit-scrollbar-thumb {
    /*滚动条里面小方块*/
    border-radius: 10px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    background: #535353;
}

.scroll::-webkit-scrollbar-track {
    /*滚动条里面轨道*/
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    background: #ededed;
}

/*
说明:
    1. 更好看的滚动条;
*/
.scroll2 {

}

.scroll2::-webkit-scrollbar {
    /*滚动条整体样式*/
    width: 10px; /*高宽分别对应横竖滚动条的尺寸*/
    height: 1px;
}

.scroll2::-webkit-scrollbar-thumb {
    /*滚动条里面小方块*/
    border-radius: 10px;
    background-color: skyblue;
    background-image: -webkit-linear-gradient(
            45deg,
            rgba(255, 255, 255, 0.2) 25%,
            transparent 25%,
            transparent 50%,
            rgba(255, 255, 255, 0.2) 50%,
            rgba(255, 255, 255, 0.2) 75%,
            transparent 75%,
            transparent
    );
}

.scroll2::-webkit-scrollbar-track {
    /*滚动条里面轨道*/
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    background: #ededed;
    border-radius: 10px;
}

.my-table {
    border-collapse: collapse;
    margin: 1rem 0;
    display: block;
    overflow-x: auto;
}

.my-table thead {
    display: table-header-group;
    vertical-align: middle;
    border-color: inherit;
}

.my-table thead tr {
    display: table-row;
    vertical-align: inherit;
    border-color: inherit;
    border-top: 1px solid #dfe2e5;
}

.my-table thead tr th {
    display: table-cell;
    vertical-align: inherit;
    font-weight: bold;
    text-align: -internal-center;
    border: 1px solid #dfe2e5;
    padding: .6em 1em;
}

.my-table tbody {
    display: table-row-group;
    vertical-align: middle;
    border-color: inherit;
}

.my-table tbody tr {
    display: table-row;
    vertical-align: inherit;
    border-color: inherit;
}

.my-table tbody tr td {
    display: table-cell;
    vertical-align: inherit;
    border: 1px solid #dfe2e5;
    padding: .6em 1em;
}

.btn {
    border: 2px solid black;
    padding: 3px;
    margin: 3px;
}

.bg-blue {
    background-color: #0e90d2;
}